(verb) be in contradiction with. Synonyms: contradict, belie.
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Verb Definition 1
(verb) deny the truth of. Synonyms: contradict, contravene.
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Verb Definition 2
(verb) prove negative; show to be false. Synonyms: contradict.
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Verb Definition 3
(verb) make ineffective by counterbalancing the effect of. Synonyms: neutralize, neutralise, nullify. Examples: "Her optimism neutralizes his gloom." "This action will negate the effect of my efforts."